<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allSuccess"/>
    </label>
    <span> <span>已完成{{successNum}}</span> / 全部{{todoList.length}} </span>
    <button class="btn btn-danger" @click="deleteSuccess">清除已完成任务</button>
  </div>
</template>

<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
  name: "Footer",
});
</script>

<script setup lang="ts">
import { computed , defineProps} from "vue";

import {todoListType} from "../../App.vue"
interface propsType{
  todoList: todoListType
  checkedAll(newValue:boolean): void
  deleteSuccess(): void
}
const props = defineProps<propsType>()

//计算已完成
const successNum = computed(()=>{
  return props.todoList.reduce((p,c)=>{
    return c.done? p+1 : p
  },0)
})

//计算全部
const allSuccess = computed({
  get(){
    return  successNum.value === props.todoList.length && props.todoList.length !== 0 
  },
  set(newValue){
    props.checkedAll(newValue as boolean)
  },
})
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
